Method and apparatus for efficient assistance data transfer in nr positioning

ABSTRACT

Provided herein is a method of performing, by a first apparatus, wireless communication. The method may include the steps of receiving configuration related to a downlink (DL) positioning reference signal (PRS) from a location management function (LMF); receiving configuration related to an uplink (UL) PRS from a base station; and performing positioning based on round trip time (RTT), based on the configuration related to the DL PRS and the configuration related to the UL PRS.

BACKGROUND OF THE DISCLOSURE Field of the disclosure

This disclosure relates to a wireless communication system.

Related Art

Sidelink (SL) communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved Node B (eNB). SL communication is under consideration as a solution to the overhead of an eNB caused by rapidly increasing data traffic.

Vehicle-to-everything (V2X) refers to a communication technology through which a vehicle exchanges information with another vehicle, a pedestrian, an object having an infrastructure (or infra) established therein, and so on. The V2X may be divided into 4 types, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2X communication may be provided via a PC5 interface and/or Uu interface.

Meanwhile, as a wider range of communication devices require larger communication capacities, the need for mobile broadband communication that is more enhanced than the existing Radio Access Technology (RAT) is rising. Accordingly, discussions are made on services and user equipment (UE) that are sensitive to reliability and latency. And, a next generation radio access technology that is based on the enhanced mobile broadband communication, massive Machine Type Communication (MTC), Ultra-Reliable and Low Latency Communication (URLLC), and so on, may be referred to as a new radio access technology (RAT) or new radio (NR). Herein, the NR may also support vehicle-to-everything (V2X) communication.

FIG. 1 is a drawing for describing V2X communication based on NR, compared to V2X communication based on RAT used before NR. The embodiment of FIG. 1 may be combined with various embodiments of the present disclosure.

Regarding V2X communication, a scheme of providing a safety service, based on a V2X message such as BSM (Basic Safety Message), CAM (Cooperative Awareness Message), and DENM (Decentralized Environmental Notification Message) is focused in the discussion on the RAT used before the NR. The V2X message may include position information, dynamic information, attribute information, or the like. For example, a UE may transmit a periodic message type CAM and/or an event triggered message type DENM to another UE.

For example, the CAM may include dynamic state information of the vehicle such as direction and speed, static data of the vehicle such as a size, and basic vehicle information such as an exterior illumination state, route details, or the like. For example, the UE may broadcast the CAM, and latency of the CAM may be less than 100ms. For example, the UE may generate the DENM and transmit it to another UE in an unexpected situation such as a vehicle breakdown, accident, or the like. For example, all vehicles within a transmission range of the UE may receive the CAM and/or the DENM. In this case, the DENM may have a higher priority than the CAM.

Thereafter, regarding V2X communication, various V2X scenarios are proposed in NR. For example, the various V2X scenarios may include vehicle platooning, advanced driving, extended sensors, remote driving, or the like.

For example, based on the vehicle platooning, vehicles may move together by dynamically forming a group. For example, in order to perform platoon operations based on the vehicle platooning, the vehicles belonging to the group may receive periodic data from a leading vehicle. For example, the vehicles belonging to the group may decrease or increase an interval between the vehicles by using the periodic data.

For example, based on the advanced driving, the vehicle may be semi-automated or fully automated. For example, each vehicle may adjust trajectories or maneuvers, based on data obtained from a local sensor of a proximity vehicle and/or a proximity logical entity. In addition, for example, each vehicle may share driving intention with proximity vehicles.

For example, based on the extended sensors, raw data, processed data, or live video data obtained through the local sensors may be exchanged between a vehicle, a logical entity, a UE of pedestrians, and/or a V2X application server. Therefore, for example, the vehicle may recognize a more improved environment than an environment in which a self-sensor is used for detection.

For example, based on the remote driving, for a person who cannot drive or a remote vehicle in a dangerous environment, a remote driver or a V2X application may operate or control the remote vehicle. For example, if a route is predictable such as public transportation, cloud computing based driving may be used for the operation or control of the remote vehicle. In addition, for example, an access for a cloud-based back-end service platform may be considered for the remote driving.

Meanwhile, a scheme of specifying service requirements for various V2X scenarios such as vehicle platooning, advanced driving, extended sensors, remote driving, or the like is discussed in NR-based V2X communication.

SUMMARY OF THE DISCLOSURE Technical Solutions

According to an embodiment, provided herein is a method of performing, by a first apparatus, wireless communication. The method may include the steps of receiving configuration related to a downlink (DL) positioning reference signal (PRS) from a location management function (LMF); receiving configuration related to an uplink (UL) PRS from a base station; and performing positioning based on round trip time (RTT), based on the configuration related to the DL PRS and the configuration related to the UL PRS.

Effects of the Disclosure

The user equipment (UE) may efficiently perform SL communication.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing for describing V2X communication based on NR, compared to V2X communication based on RAT used before NR.

FIG. 2 shows a structure of an NR system, in accordance with an embodiment of the present disclosure.

FIG. 3 shows a functional division between an NG-RAN and a SGC, in accordance with an embodiment of the present disclosure.

FIG. 4 shows a radio protocol architecture, in accordance with an embodiment of the present disclosure.

FIG. 5 shows a structure of an NR system, in accordance with an embodiment of the present disclosure.

FIG. 6 shows a structure of a slot of an NR frame, in accordance with an embodiment of the present disclosure.

FIG. 7 shows an example of a BWP, in accordance with an embodiment of the present disclosure.

FIG. 8 shows a radio protocol architecture for a SL communication, in accordance with an embodiment of the present disclosure.

FIG. 9 shows a UE performing V2X or SL communication, in accordance with an embodiment of the present disclosure.

FIG. 10 shows a procedure of performing V2X or SL communication by a UE based on a transmission mode, in accordance with an embodiment of the present disclosure.

FIG. 11 shows three cast types, in accordance with an embodiment of the present disclosure.

FIG. 12 shows an example of an architecture of a 5G system capable of positioning a UE, in accordance with an embodiment of the present disclosure.

FIG. 13 shows an example of implementing a network for measuring a location of a UE, in accordance with an embodiment of the present disclosure.

FIG. 14 shows an example of a protocol layer used to support LTE positioning protocol (LPP) message transmission between an LMF and a UE, in accordance with an embodiment of the present disclosure.

FIG. 15 shows an example of a protocol layer used to support NR positioning protocol A (NRPPa) PDU transmission, in accordance with an embodiment of the present disclosure.

FIG. 16 shows a drawing for explaining an OTDOA positioning method, in accordance with an embodiment of the present disclosure.

FIG. 17 shows an LMF subscription-based method for receiving available assistance data configuration from gNB, in accordance with an embodiment of the present disclosure.

FIG. 18 shows the issue pertaining to the duplicate SSB configuration to the UE, in accordance with an embodiment of the present disclosure.

FIG. 19 shows the common SSB signalling configuration using RRC, in accordance with an embodiment of the present disclosure.

FIG. 20 shows the common SSB signalling configuration using LPP, in accordance with an embodiment of the present disclosure.

FIG. 21 shows a procedure of receiving configuration by a first apparatus, in accordance with an embodiment of the present disclosure.

FIG. 22 shows a procedure of transmitting configuration by a base station, in accordance with an embodiment of the present disclosure.

FIG. 23 shows a communication system 1, in accordance with an embodiment of the present disclosure.

FIG. 24 shows wireless devices, in accordance with an embodiment of the present disclosure.

FIG. 25 shows a signal process circuit for a transmission signal, in accordance with an embodiment of the present disclosure.

FIG. 26 shows a wireless device, in accordance with an embodiment of the present disclosure.

FIG. 27 shows a hand-held device, in accordance with an embodiment of the present disclosure.

FIG. 28 shows a car or an autonomous vehicle, in accordance with an embodiment of the present disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

In the present specification, “A or B” may mean “only A”, “only B” or “both A and B.” In other words, in the present specification, “A or B” may be interpreted as “A and/or B”. For example, in the present specification, “A, B, or C” may mean “only A”, “only B”, “only C”, or “any combination of A, B, C”

A slash (/) or comma used in the present specification may mean “and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B” may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C” may mean “A, B, or C”

In the present specification, “at least one of A and B” may mean “only A”, “only B”, or “both A and B”. In addition, in the present specification, the expression “at least one of A or B” or “at least one of A and/or B” may be interpreted as “at least one of A and B”

In addition, in the present specification, “at least one of A, B, and C” may mean “only A”, “only B”, “only C”, or “any combination of A, B, and C”. In addition, “at least one of A, B, or C” or “at least one of A, B, and/or C” may mean “at least one of A, B, and C”

In addition, a parenthesis used in the present specification may mean “for example”. Specifically, when indicated as “control information (PDCCH)”, it may mean that “PDCCH” is proposed as an example of the “control information”. In other words, the “control information” of the present specification is not limited to “PDCCH”, and “PDDCH” may be proposed as an example of the “control information”. In addition, when indicated as “control information (i.e., PDCCH)”, it may also mean that “PDCCH” is proposed as an example of the “control information”

A technical feature described individually in one figure in the present specification may be individually implemented, or may be simultaneously implemented.

The technology described below may be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and so on. The CDMA may be implemented with a radio technology, such as universal terrestrial radio access (UTRA) or CDMA-2000. The TDMA may be implemented with a radio technology, such as global system for mobile communications (GSM)/general packet ratio service (GPRS)/enhanced data rate for GSM evolution (EDGE). The OFDMA may be implemented with a radio technology, such as institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA (E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16e and provides backward compatibility with a system based on the IEEE 802.16e. The UTRA is part of a universal mobile telecommunication system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTE uses the OFDMA in a downlink and uses the SC-FDMA in an uplink. LTE-advanced (LTE-A) is an evolution of the LTE.

5G NR is a successive technology of LTE-A corresponding to a new Clean-slate type mobile communication system having the characteristics of high performance, low latency, high availability, and so on. 5G NR may use resources of all spectrum available for usage including low frequency bands of less than 1GHz, middle frequency bands ranging from 1GHz to 10GHz, high frequency (millimeter waves) of 24GHz or more, and so on.

For clarity in the description, the following description will mostly focus on LTE-A or 5G NR. However, technical features according to an embodiment of the present disclosure will not be limited only to this.

FIG. 2 shows a structure of an NR system, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 2 may be combined with various embodiments of the present disclosure.

Referring to FIG. 2 , a next generation-radio access network (NG-RAN) may include a BS 20 providing a UE 10 with a user plane and control plane protocol termination. For example, the BS 20 may include a next generation-Node B (gNB) and/or an evolved-NodeB (eNB). For example, the UE 10 may be fixed or mobile and may be referred to as other terms, such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), wireless device, and so on. For example, the BS may be referred to as a fixed station which communicates with the UE 10 and may be referred to as other terms, such as a base transceiver system (BTS), an access point (AP), and so on.

The embodiment of FIG. 2 exemplifies a case where only the gNB is included. The BSs 20 may be connected to one another via Xn interface. The BS 20 may be connected to one another via 5th generation (5G) core network (5GC) and NG interface. More specifically, the BSs 20 may be connected to an access and mobility management function (AMF) 30 via NG-C interface, and may be connected to a user plane function (UPF) 30 via NG-U interface.

FIG. 3 shows a functional division between an NG-RAN and a 5GC, in accordance with an embodiment of the present disclosure.

Referring to FIG. 3 , the gNB may provide functions, such as Inter Cell Radio Resource Management (RRM), Radio Bearer (RB) control, Connection Mobility Control, Radio Admission Control, Measurement Configuration & Provision, Dynamic Resource Allocation, and so on. An AMF may provide functions, such as Non Access Stratum (NAS) security, idle state mobility processing, and so on. A UPF may provide functions, such as Mobility Anchoring, Protocol Data Unit (PDU) processing, and so on. A Session Management Function (SMF) may provide functions, such as user equipment (UE) Internet Protocol (IP) address allocation, PDU session control, and so on.

Layers of a radio interface protocol between the UE and the network can be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the open system interconnection (OSI) model that is well-known in the communication system. Among them, a physical (PHY) layer belonging to the first layer provides an information transfer service by using a physical channel, and a radio resource control (RRC) layer belonging to the third layer serves to control a radio resource between the UE and the network. For this, the RRC layer exchanges an RRC message between the UE and the BS.

FIG. 4 shows a radio protocol architecture, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 4 may be combined with various embodiments of the present disclosure. Specifically, FIG. 4(a) shows a radio protocol architecture for a user plane, and FIG. 4(b) shows a radio protocol architecture for a control plane. The user plane corresponds to a protocol stack for user data transmission, and the control plane corresponds to a protocol stack for control signal transmission.

Referring to FIG. 4 , a physical layer provides an upper layer with an information transfer service through a physical channel. The physical layer is connected to a medium access control (MAC) layer which is an upper layer of the physical layer through a transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how and with what characteristics data is transmitted through a radio interface.

Between different physical layers, i.e., a physical layer of a transmitter and a physical layer of a receiver, data are transferred through the physical channel. The physical channel is modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and utilizes time and frequency as a radio resource.

The MAC layer provides services to a radio link control (RLC) layer, which is a higher layer of the MAC layer, via a logical channel. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data transfer services over logical channels.

The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Unit (RLC SDU). In order to ensure diverse quality of service (QoS) required by a radio bearer (RB), the RLC layer provides three types of operation modes, i.e., a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM). An AM RLC provides error correction through an automatic repeat request (ARQ).

A radio resource control (RRC) layer is defined only in the control plane. The RRC layer serves to control the logical channel, the transport channel, and the physical channel in association with configuration, reconfiguration and release of RBs. The RB is a logical path provided by the first layer (i.e., the physical layer or the PHY layer) and the second layer (i.e., the MAC layer, the RLC layer, and the packet data convergence protocol (PDCP) layer) for data delivery between the UE and the network.

Functions of a packet data convergence protocol (PDCP) layer in the user plane include user data delivery, header compression, and ciphering. Functions of a PDCP layer in the control plane include control-plane data delivery and ciphering/integrity protection.

A service data adaptation protocol (SDAP) layer is defined only in a user plane. The SDAP layer performs mapping between a Quality of Service (QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) marking in both DL and UL packets.

The configuration of the RB implies a process for specifying a radio protocol layer and channel properties to provide a particular service and for determining respective detailed parameters and operations. The RB can be classified into two types, i.e., a signaling RB (SRB) and a data RB (DRB). The SRB is used as a path for transmitting an RRC message in the control plane. The DRB is used as a path for transmitting user data in the user plane.

When an RRC connection is established between an RRC layer of the UE and an RRC layer of the E-UTRAN, the UE is in an RRC_CONNECTED state, and, otherwise, the UE may be in an RRC IDLE state. In case of the NR, an RRC INACTIVE state is additionally defined, and a UE being in the RRC INACTIVE state may maintain its connection with a core network whereas its connection with the BS is released.

Data is transmitted from the network to the UE through a downlink transport channel. Examples of the downlink transport channel include a broadcast channel (BCH) for transmitting system information and a downlink-shared channel (SCH) for transmitting user traffic or control messages. Traffic of downlink multicast or broadcast services or the control messages can be transmitted on the downlink-SCH or an additional downlink multicast channel (MCH). Data is transmitted from the UE to the network through an uplink transport channel. Examples of the uplink transport channel include a random access channel (RACH) for transmitting an initial control message and an uplink SCH for transmitting user traffic or control messages.

Examples of logical channels belonging to a higher channel of the transport channel and mapped onto the transport channels include a broadcast channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.

The physical channel includes several OFDM symbols in a time domain and several sub-carriers in a frequency domain. One sub-frame includes a plurality of OFDM symbols in the time domain. A resource block is a unit of resource allocation, and consists of a plurality of OFDM symbols and a plurality of sub-carriers. Further, each subframe may use specific sub-carriers of specific OFDM symbols (e.g., a first OFDM symbol) of a corresponding subframe for a physical downlink control channel (PDCCH), i.e., an L1/L2 control channel. A transmission time interval (TTI) is a unit time of subframe transmission.

FIG. 5 shows a structure of an NR system, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 5 may be combined with various embodiments of the present disclosure.

Referring to FIG. 5 , in the NR, a radio frame may be used for performing uplink and downlink transmission. A radio frame has a length of 10ms and may be defined to be configured of two half-frames (HFs). A half-frame may include five lms subframes (SFs). A subframe (SF) may be divided into one or more slots, and the number of slots within a subframe may be determined in accordance with subcarrier spacing (SCS). Each slot may include 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP).

In case of using a normal CP, each slot may include 14 symbols. In case of using an extended CP, each slot may include 12 symbols. Herein, a symbol may include an OFDM symbol (or CP-OFDM symbol) and a Single Carrier-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbol).

Table 1 shown below represents an example of a number of symbols per slot (N^(slot) _(symb)), a number slots per frame (N^(frame,u) _(slot)), and a number of slots per subframe (N^(subframe,u) _(slot)) in accordance with an SCS configuration (u), in a case where a normal CP is used.

TABLE 1 SCS (15*2^(u)) N^(slot) _(symb) N^(frame, u) _(slot) N^(subframe, u) _(slot) 15 KHz (u = 0) 14 10 1 30 KHz (u = 1) 14 20 2 60 KHz (u = 2) 14 40 4 120 KHz (u = 3)  14 80 8 240 KHz (u = 4)  14 160 16

Table 2 shows an example of a number of symbols per slot, a number of slots per frame, and a number of slots per subframe in accordance with the SCS, in a case where an extended CP is used.

TABLE 2 SCS (15*2^(u)) N^(slot) _(symb) N^(frame, u) _(slot) N^(subframe, u) _(slot) 60 KHz (u = 2) 12 40 4

In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, and so on) between multiple cells being integrate to one UE may be differently configured. Accordingly, a (absolute time) duration (or section) of a time resource (e.g., subframe, slot or TTI) (collectively referred to as a time unit (TU) for simplicity) being configured of the same number of symbols may be differently configured in the integrated cells.

In the NR, multiple numerologies or SCSs for supporting diverse 5G services may be supported. For example, in case an SCS is 15kHz, a wide area of the conventional cellular bands may be supported, and, in case an SCS is 30kHz/60kHz a dense-urban, lower latency, wider carrier bandwidth may be supported. In case the SCS is 60kHz or higher, a bandwidth that is greater than 24.25GHz may be used in order to overcome phase noise.

An NR frequency band may be defined as two different types of frequency ranges. The two different types of frequency ranges may be FR1 and FR2. The values of the frequency ranges may be changed (or varied), and, for example, the two different types of frequency ranges may be as shown below in Table 3. Among the frequency ranges that are used in an NR system, FR1 may mean a “sub 6GHz range”, and FR2 may mean an “above 6GHz range” and may also be referred to as a millimeter wave (mmW).

TABLE 3 Frequency Range Corresponding Subcarrier designation frequency range Spacing (SCS) FR1  450 MHz-6000 MHz  15, 30, 60 kHz FR2 24250 MHz-52600 MHz 60, 120, 240 kHz

As described above, the values of the frequency ranges in the NR system may be changed (or varied). For example, as shown below in Table 4, FR1 may include a band within a range of 410MHz to 7125MHz. More specifically, FR1 may include a frequency band of 6GHz (or 5850, 5900, 5925 MHz, and so on) and higher. For example, a frequency band of 6GHz (or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1 mat include an unlicensed band. The unlicensed band may be used for diverse purposes, e.g., the unlicensed band for vehicle-specific communication (e.g., automated driving).

TABLE 4 Frequency Range Corresponding Subcarrier designation frequency range Spacing (SCS) FR1  410 MHz-7125 MHz  15, 30, 60 kHz FR2 24250 MHz-52600 MHz 60, 120, 240 kHz

FIG. 6 shows a structure of a slot of an NR frame, in accordance with an embodiment of the present disclosure. Referring to FIG. 6 , a slot includes a plurality of symbols in a time domain.

For example, in case of a normal CP, one slot may include 14 symbols. However, in case of an extended CP, one slot may include 12 symbols. Alternatively, in case of a normal CP, one slot may include 7 symbols. However, in case of an extended CP, one slot may include 6 symbols.

A carrier includes a plurality of subcarriers in a frequency domain. A Resource Block (RB) may be defined as a plurality of consecutive subcarriers (e.g., 12 subcarriers) in the frequency domain. A Bandwidth Part (BWP) may be defined as a plurality of consecutive (Physical) Resource Blocks ((P)RBs) in the frequency domain, and the BWP may correspond to one numerology (e.g., SCS, CP length, and so on). A carrier may include a maximum of N number BWPs (e.g., 5 BWPs). Data communication may be performed via an activated BWP. Each element may be referred to as a Resource Element (RE) within a resource grid and one complex symbol may be mapped to each element.

Meanwhile, a radio interface between a UE and another UE or a radio interface between the UE and a network may consist of an L1 layer, an L2 layer, and an L3 layer. In various embodiments of the present disclosure, the L1 layer may imply a physical layer. In addition, for example, the L2 layer may imply at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. In addition, for example, the L3 layer may imply an RRC layer.

Hereinafter, a bandwidth part (BWP) and a carrier will be described.

The BWP may be a set of consecutive physical resource blocks (PRBs) in a given numerology. The PRB may be selected from consecutive sub-sets of common resource blocks (CRBs) for the given numerology on a given carrier.

When using bandwidth adaptation (BA), a reception bandwidth and transmission bandwidth of a UE are not necessarily as large as a bandwidth of a cell, and the reception bandwidth and transmission bandwidth of the BS may be adjusted. For example, a network/BS may inform the UE of bandwidth adjustment. For example, the UE receive information/configuration for bandwidth adjustment from the network/BS. In this case, the UE may perform bandwidth adjustment based on the received information/configuration. For example, the bandwidth adjustment may include an increase/decrease of the bandwidth, a position change of the bandwidth, or a change in subcarrier spacing of the bandwidth.

For example, the bandwidth may be decreased during a period in which activity is low to save power. For example, the position of the bandwidth may move in a frequency domain. For example, the position of the bandwidth may move in the frequency domain to increase scheduling flexibility. For example, the subcarrier spacing of the bandwidth may be changed. For example, the subcarrier spacing of the bandwidth may be changed to allow a different service. A subset of a total cell bandwidth of a cell may be called a bandwidth part (BWP). The BA may be performed when the BS/network configures the BWP to the UE and the BS/network informs the UE of the BWP currently in an active state among the configured BWPs.

For example, the BWP may be at least any one of an active BWP, an initial BWP, and/or a default BWP. For example, the UE may not monitor downlink radio link quality in a DL BWP other than an active DL BWP on a primary cell (PCell). For example, the UE may not receive PDCCH, PDSCH, or CSI-RS (excluding RRM) outside the active DL BWP. For example, the UE may not trigger a channel state information (CSI) report for the inactive DL BWP. For example, the UE may not transmit PUCCH or PUSCH outside an active UL BWP. For example, in a downlink case, the initial BWP may be given as a consecutive RB set for an RMSI CORESET (configured by PBCH). For example, in an uplink case, the initial BWP may be given by SIB for a random access procedure. For example, the default BWP may be configured by a higher layer. For example, an initial value of the default BWP may be an initial DL BWP. For energy saving, if the UE fails to detect DCI during a specific period, the UE may switch the active BWP of the UE to the default BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used in transmission and reception. For example, a transmitting UE may transmit an SL channel or an SL signal on a specific BWP, and a receiving UE may receive the SL channel or the SL signal on the specific BWP. In a licensed carrier, the SL BWP may be defined separately from a Uu BWP, and the SL BWP may have configuration signaling separate from the Uu BWP. For example, the UE may receive a configuration for the SL BWP from the BS/network. The SL BWP may be (pre-)configured in a carrier with respect to an out-of-coverage NR V2X UE and an RRC_IDLE UE. For the UE in the RRC_CONNECTED mode, at least one SL BWP may be activated in the carrier.

FIG. 7 shows an example of a BWP, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 7 may be combined with various embodiments of the present disclosure. It is assumed in the embodiment of FIG. 7 that the number of BWPs is 3.

Referring to FIG. 7 , a common resource block (CRB) may be a carrier resource block numbered from one end of a carrier band to the other end thereof. In addition, the PRB may be a resource block numbered within each BWP. A point A may indicate a common reference point for a resource block grid.

The BWP may be configured by a point A, an offset N^(start) _(BWP) from the point A, and a bandwidth N^(size) _(BWP). For example, the point A may be an external reference point of a PRB of a carrier in which a subcarrier 0 of all numerologies (e.g., all numerologies supported by a network on that carrier) is aligned. For example, the offset may be a PRB interval between a lowest subcarrier and the point A in a given numerology. For example, the bandwidth may be the number of PRBs in the given numerology.

Hereinafter, V2X or SL communication will be described.

FIG. 8 shows a radio protocol architecture for a SL communication, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 8 may be combined with various embodiments of the present disclosure. More specifically, FIG. 8(a) shows a user plane protocol stack, and FIG. 8(b) shows a control plane protocol stack.

Hereinafter, a sidelink synchronization signal (SLSS) and synchronization information will be described.

The SLSS may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS), as an SL-specific sequence. The PSSS may be referred to as a sidelink primary synchronization signal (S-PSS), and the SSSS may be referred to as a sidelink secondary synchronization signal (S-SSS). For example, length-127 M-sequences may be used for the S-PSS, and length-127 gold sequences may be used for the S-SSS. For example, a UE may use the S-PSS for initial signal detection and for synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information which must be first known by the UE before SL signal transmission/reception. For example, the default information may be information related to SLSS, a duplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL) configuration, information related to a resource pool, a type of an application related to the SLSS, a subframe offset, broadcast information, or the like. For example, for evaluation of PSBCH performance, in NR V2X, a payload size of the PSBCH may be 56 bits including 24-bit CRC.

The S-PSS, the S-SSS, and the PSBCH may be included in a block format (e.g., SL synchronization signal (SS)/PSBCH block, hereinafter, sidelink-synchronization signal block (S-SSB)) supporting periodical transmission. The S-SSB may have the same numerology (i.e., SCS and CP length) as a physical sidelink control channel (PSCCH)/physical sidelink shared channel (PSSCH) in a carrier, and a transmission bandwidth may exist within a (pre-)configured sidelink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (RBs). For example, the PSBCH may exist across 11 RBs. In addition, a frequency position of the S-SSB may be (pre-)configured. Accordingly, the UE does not have to perform hypothesis detection at frequency to discover the S-SSB in the carrier.

FIG. 9 shows a UE performing V2X or SL communication, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 9 may be combined with various embodiments of the present disclosure.

Referring to FIG. 9 , in V2X or SL communication, the term ‘UE’ may generally imply a UE of a user. However, if a network equipment such as a BS transmits/receives a signal according to a communication scheme between UEs, the BS may also be regarded as a sort of the UE. For example, a UE1 may be a first apparatus 100, and a UE2 may be a second apparatus 200.

For example, the UE1 may select a resource unit corresponding to a specific resource in a resource pool which implies a set of series of resources. In addition, the UE1 may transmit an SL signal by using the resource unit. For example, a resource pool in which the UE1 is capable of transmitting a signal may be configured to the UE2 which is a receiving UE, and the signal of the UE1 may be detected in the resource pool.

Herein, if the UE1 is within a connectivity range of the BS, the BS may inform the UE1 of the resource pool. Otherwise, if the UE1 is out of the connectivity range of the BS, another UE may inform the UE1 of the resource pool, or the UE1 may use a pre-configured resource pool.

In general, the resource pool may be configured in unit of a plurality of resources, and each UE may select a unit of one or a plurality of resources to use it in SL signal transmission thereof

Hereinafter, resource allocation in SL will be described.

FIG. 10 shows a procedure of performing V2X or SL communication by a UE based on a transmission mode, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 10 may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be called a mode or a resource allocation mode. Hereinafter, for convenience of explanation, in LTE, the transmission mode may be called an LTE transmission mode. In NR, the transmission mode may be called an NR resource allocation mode.

For example, FIG. 10(a) shows a UE operation related to an LTE transmission mode 1 or an LTE transmission mode 3. Alternatively, for example, FIG. 10(a) shows a UE operation related to an NR resource allocation mode 1. For example, the LTE transmission mode 1 may be applied to general SL communication, and the LTE transmission mode 3 may be applied to V2X communication.

For example, FIG. 10(b) shows a UE operation related to an LTE transmission mode 2 or an LTE transmission mode 4. Alternatively, for example, FIG. 10(b) shows a UE operation related to an NR resource allocation mode 2.

Referring to FIG. 10(a), in the LTE transmission mode 1, the LTE transmission mode 3, or the NR resource allocation mode 1, a BS may schedule an SL resource to be used by the UE for SL transmission. For example, the BS may perform resource scheduling to a UE1 through a PDCCH (more specifically, downlink control information (DCI)), and the UE lmay perform V2X or SL communication with respect to a UE2 according to the resource scheduling. For example, the UE1 may transmit a sidelink control information (SCI) to the UE2 through a physical sidelink control channel (PSCCH), and thereafter transmit data based on the SCI to the UE2 through a physical sidelink shared channel (PSSCH).

Referring to FIG. 10(b), in the LTE transmission mode 2, the LTE transmission mode 4, or the NR resource allocation mode 2, the UE may determine an SL transmission resource within an SL resource configured by a BS/network or a pre-configured SL resource. For example, the configured SL resource or the pre-configured SL resource may be a resource pool. For example, the UE may autonomously select or schedule a resource for SL transmission. For example, the UE may perform SL communication by autonomously selecting a resource within a configured resource pool. For example, the UE may autonomously select a resource within a selective window by performing a sensing and resource (re)selection procedure. For example, the sensing may be performed in unit of subchannels. In addition, the UE1 which has autonomously selected the resource within the resource pool may transmit the SCI to the UE2 through a PSCCH, and thereafter may transmit data based on the SCI to the UE2 through a PSSCH.

FIG. 11 shows three cast types, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 11 may be combined with various embodiments of the present disclosure. Specifically, FIG. 11(a) shows broadcast-type SL communication, FIG. 11(b) shows unicast type-SL communication, and FIG. 11(c) shows groupcast-type SL communication. In case of the unicast-type SL communication, a UE may perform one-to-one communication with respect to another UE. In case of the groupcast-type SL transmission, the UE may perform SL communication with respect to one or more UEs in a group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication may be replaced with SL multicast communication, SL one-to-many communication, or the like.

FIG. 12 shows an example of an architecture of a 5G system capable of positioning a UE having access to a next generation-radio access network (NG-RAN) or an E-UTRAN based on an embodiment of the present disclosure.

Referring to FIG. 12 , an AMF may receive a request for a location service related to a specific target UE from a different entity such as a gateway mobile location center (GMLC), or may determine to start the location service in the AMF itself instead of the specific target UE. Then, the AMF may transmit a location service request to a location management function (LMF). Upon receiving the location service request, the LMF may process the location service request and return a processing request including an estimated location or the like of the UE to the AMF. Meanwhile, if the location service request is received from the different entity such as GMLC other than the AMF, the AMF may transfer to the different entity the processing request received from the LMF.

A new generation evolved-NB (ng-eNB) and a gNB are network elements of NG-RAN capable of providing a measurement result for location estimation, and may measure a radio signal for a target UE and may transfer a resultant value to the LMF. In addition, the ng-eNB may control several transmission points (TPs) such as remote radio heads or PRS-dedicated TPs supporting a positioning reference signal (PRS)-based beacon system for E-UTRA.

The LMF may be connected to an enhanced serving mobile location center (E-SMLC), and the E-SMLC may allow the LMF to access E-UTRAN. For example, the E-SMLC may allow the LMF to support observed time difference of arrival (OTDOA), which is one of positioning methods of E-UTRAN, by using downlink measurement obtained by a target UE through a signal transmitted from the gNB and/or the PRS-dedicated TPs in the E-UTRAN.

Meanwhile, the LMF may be connected to an SUPL location platform (SLP). The LMF may support and manage different location determining services for respective target UEs. The LMF may interact with a serving ng-eNB or serving gNB for the target UE to obtain location measurement of the UE. For positioning of the target UE, the LMF may determine a positioning method based on a location service (LCS) client type, a requested quality of service (QoS), UE positioning capabilities, gNB positioning capabilities, and ng-eNB positioning capabilities, or the like, and may apply such a positioning method to the serving gNB and/or the serving ng-eNB. In addition, the LMF may determine additional information such as a location estimation value for the target UE and accuracy of location estimation and speed. The SLP is a secure user plane location (SUPL) entity in charge of positioning through a user plane.

The UE may measure a downlink signal through NG-RAN, E-UTRAN, and/or other sources such as different global navigation satellite system (GNSS) and terrestrial beacon system (TBS), wireless local access network (WLAN) access points, Bluetooth beacons, UE barometric pressure sensors or the like. The UE may include an LCS application. The UE may communicate with a network to which the UE has access, or may access the LCS application through another application included in the UE. The LCS application may include a measurement and calculation function required to determine a location of the UE. For example, the UE may include an independent positioning function such as a global positioning system (GPS), and may report the location of the UE independent of NG-RAN transmission. Positioning information obtained independently as such may be utilized as assistance information of the positioning information obtained from the network.

FIG. 13 shows an example of implementing a network for measuring a location of a UE based on an embodiment of the present disclosure.

When the UE is in a connection management (CM)-IDLE state, if an AMF receives a location service request, the AMF may establish a signaling connection with the UE, and may request for a network trigger service to allocate a specific serving gNB or ng-eNB. Such an operational process is omitted in FIG. 13 . That is, it may be assumed in FIG. 13 that the UE is in a connected mode. However, due to signaling and data inactivation or the like, the signaling connection may be released by NG-RAN while a positioning process is performed.

A network operation process for measuring a location of a UE will be described in detail with reference to FIG. 13 . In step S1310A, a 5GC entity such as GMLC may request a serving AMF to provide a location service for measuring a location of a target UE. However, even if the GMLC does not request for the location service, based on step S1310B, the serving AMF may determine that the location service for measuring the location of the target UE is required. For example, to measure the location of the UE for an emergency call, the serving AMF may determine to directly perform the location service.

Thereafter, the AMF may transmit the location service request to an LMF based on step S1320, and the LMF may start location procedures to obtain location measurement data or location measurement assistance data together with a serving ng-eNB and a serving gNB. Additionally, based on step 1330B, the LMF may start location procedures for downlink positioning together with the UE. For example, the LMF may transmit assistance data defined in 3GPP TS 36.355, or may obtain a location estimation value or a location measurement value. Meanwhile, step S1330B may be performed additionally after step S1330A is performed, or may be performed instead of step S1330A.

In step S1340, the LMF may provide a location service response to the AMF. In addition, the location service response may include information on whether location estimation of the UE is successful and a location estimation value of the UE. Thereafter, if the procedure of FIG. 13 is initiated by step S1310A, the AMF may transfer the location service response to a 5GC entity such as GMLC, and if the procedure of FIG. 13 is initiated by step S1310B, the AMF may use the location service response to provide a location service related to an emergency call or the like.

FIG. 14 shows an example of a protocol layer used to support LTE positioning protocol (LPP) message transmission between an LMF and a UE based on an embodiment of the present disclosure.

An LPP PDU may be transmitted through a NAS PDU between an AMF and the UE. Referring to FIG. 14 , an LPP may be terminated between a target device (e.g., a UE in a control plane or an SUPL enabled terminal (SET) in a user plane) and a location server (e.g., an LMF in the control plane and an SLP in the user plane). The LPP message may be transferred in a form of a transparent PDU through an intermediary network interface by using a proper protocol such as an NG application protocol (NGAP) through an NG-control plane (NG-C) interface and NAS/RRC or the like through an NR-Uu interface. The LPP protocol may enable positioning for NR and LTE by using various positioning methods.

For example, based on the LPP protocol, the target device and the location server may exchange mutual capability information, assistance data for positioning, and/or location information. In addition, an LPP message may be used to indicate exchange of error information and/or interruption of the LPP procedure.

FIG. 15 shows an example of a protocol layer used to support NR positioning protocol A (NRPPa) PDU transmission between an LMF and an NG-RAN node based on an embodiment of the present disclosure.

The NRPPa may be used for information exchange between the NG-RAN node and the LMF. Specifically, the NRPPa may exchange an enhanced-cell ID (E-CID) for measurement, data for supporting an OTDOA positioning method, and a cell-ID, cell location ID, or the like for an NR cell ID positioning method, transmitted from the ng-eNB to the LMF. Even if there is no information on an associated NRPPa transaction, the AMF may route NRPPa PDUs based on a routing ID of an associated LMR through an NG-C interface.

A procedure of an NRPPa protocol for location and data collection may be classified into two types. A first type is a UE associated procedure for transferring information on a specific UE (e.g., location measurement information or the like), and a second type is a non UE associated procedure for transferring information (e.g. gNB/ng-eNB/TP timing information, etc.) applicable to an NG-RAN node and associated TPs. The two types of the procedure may be independently supported or may be simultaneously supported.

Meanwhile, examples of positioning methods supported in NG-RAN may include GNSS, OTDOA, enhanced cell ID (E-CID), barometric pressure sensor positioning, WLAN positioning, Bluetooth positioning and terrestrial beacon system (TBS), uplink time difference of arrival (UTDOA), etc.

(1) OTDOA (Observed Time Difference of Arrival)

FIG. 16 shows a drawing for explaining an OTDOA positioning method based on an embodiment of the present disclosure.

The OTDOA positioning method uses measurement timing of downlink signals received by a UE from an eNB, an ng-eNB, and a plurality of TPs including a PRS-dedicated TP. The UE measures timing of downlink signals received by using location assistance data received from a location server. In addition, a location of the UE may be determined based on such a measurement result and geometric coordinates of neighboring TPs.

A UE connected to a gNB may request for a measurement gap for OTDOA measurement from the TP. If the UE cannot recognize a single frequency network (SFN) for at least one TP in the OTDOA assistance data, the UE may use an autonomous gap to obtain an SNF of an OTDOA reference cell before the measurement gap is requested to perform reference signal time difference (RSTD) measurement.

Herein, the RSTD may be defined based on a smallest relative time difference between boundaries of two subframes received respectively from a reference cell and a measurement cell. That is, the RSTD may be calculated based on a relative time difference between a start time of a subframe received from the measurement cell and a start time of a subframe of a reference cell closest to the start time of the subframe received from the measurement cell. Meanwhile, the reference cell may be selected by the UE.

For correct OTDOA measurement, it may be necessary to measure a time of arrival (TOA) of a signal received from three or more TPs or BSs geometrically distributed. For example, a TOA may be measured for each of a TP1, a TP2, and a TP3, and RSTD for TP 1-TP 2, RSTD for TP 2-TP 3, and RSTD for TP 3-TP 1 may be calculated for the three TOAs. Based on this, a geometric hyperbola may be determined, and a point at which these hyperbolas intersect may be estimated as a location of a UE. In this case, since accuracy and/or uncertainty for each TOA measurement may be present, the estimated location of the UE may be known as a specific range based on measurement uncertainty.

For example, RSTD for two TPs may be calculated based on Equation 1.

$\begin{matrix} {{RSTDi},{1 = {\frac{\sqrt{\left( {x_{t} - x_{i}} \right)^{2} + \left( {y_{t} - y_{i}} \right)^{2}}}{c} - \frac{\sqrt{\left( {x_{t} - x_{1}} \right)^{2} + \left( {y_{t} - y_{1}} \right)^{2}}}{c} + \left( {T_{i} - T_{1}} \right) + \left( {n_{i} - n_{1}} \right)}}} & \left\lbrack {{Equation}1} \right\rbrack \end{matrix}$

Herein, c may be the speed of light, {x_(t), y_(t)} may be a (unknown) coordinate of a target UE, {x_(i), y_(i)} may be a coordinate of a (known) TP, and {x₁, y₁} may be a coordinate of a reference TP (or another TP). Herein, (T_(i)-T₁) may be referred to as “real time differences (RTDs)” as a transmission time offset between two TPs, and n_(i), n₁ may represent values related to UE TOA measurement errors.

(2) E-CID (Enhanced Cell ID)

In a cell ID (CID) positioning method, a location of a UE may be measured through geometric information of a serving ng-eNB, serving gNB, and/or serving cell of the UE. For example, the geometric information of the serving ng-eNB, serving gNB, and/or serving cell may be obtained through paging, registration, or the like.

Meanwhile, in addition to the CID positioning method, an E-CID positioning method may use additional UE measurement and/or NG-RAN radio resources or the like to improve a UE location estimation value. In the E-CID positioning method, although some of the measurement methods which are the same as those used in a measurement control system of an RRC protocol may be used, additional measurement is not performed in general only for location measurement of the UE. In other words, a measurement configuration or a measurement control message may not be provided additionally to measure the location of the UE. Also, the UE may not expect that an additional measurement operation only for location measurement will be requested, and may report a measurement value obtained through measurement methods in which the UE can perform measurement in a general manner.

Referring to an embodiment of the present disclosure, the serving gNB may use an E-UTRA measurement value provided from the UE to implement the E-CID positioning method.

Examples of a measurement element that can be used for E-CID positioning may be as follows.

UE measurement: E-UTRA reference signal received power (RSRP), E-UTRA reference signal received quality (RSRQ), UE E-UTRA Rx-Tx Time difference, GSM EDGE random access network (GERAN)/WLAN reference signal strength indication (RSSI), UTRAN common pilot channel (CPICH) received signal code power (RSCP), and/or UTRAN CPICH Ec/Io

E-UTRAN measurement: ng-eNB Rx-Tx Time difference, timing advance (TADV), and/or angle of arrival (AoA)

Herein, the TADV may be classified into Type 1 and Type 2 as follows.

TADV Type 1=(ng-eNB Rx-Tx time difference)+(UE E-UTRA Rx-Tx time difference)

TADV Type 2=ng-eNB Rx-Tx time difference

Meanwhile, AoA may be used to measure a direction of the UE. The AoA may be defined as an estimation angle with respect to the location of the UE counterclockwise from a BS/TP. In this case, a geographic reference direction may be north. The BS/TP may use an uplink signal such as a sounding reference signal (SRS) and/or a demodulation reference signal (DMRS) for AoA measurement. In addition, the larger the arrangement of the antenna array, the higher the measurement accuracy of the AoA. When the antenna arrays are arranged with the same interval, signals received from adjacent antenna elements may have a constant phase-rotate.

(3) UTDOA (Uplink Time Difference of Arrival)

UTDOA is a method of determining a location of a UE by estimating an arrival time of SRS. When calculating an estimated SRS arrival time, the location of the UE may be estimated through an arrival time difference with respect to another cell (or BS/TP) by using a serving cell as a reference cell. In order to implement the UTDOA, E-SMLC may indicate a serving cell of a target UE to indicate SRS transmission to the target UE. In addition, the E-SMLC may provide a configuration such as whether the SRS is periodical/aperiodic, a bandwidth, frequency/group/sequence hopping, and/or the like.

Meanwhile, the following issues are observed in relation to the current NR Positioning design:

1. There is a need to avoid the ping pong effect of the Information Request and Response Procedure between the serving gNB and LMF for every occasion that the gNB cannot provide UL SRS (UL-PRS) resources for the requested TRPs by the LMF. The result of which may affect the overall latency of receiving the UL-PRS configuration while increasing the signalling overhead over the NRPPa and radio air interface.

2. In the current signalling protocol design, there is a definite possibility for delivering a duplicate SSB configuration to the UE relating to the DL-PRS and UL-PRS configurations especially with respect to the Multi-RTT positioning technique from the LMF (LPP) and gNB (RRC) respectively via the assistance data. This may incur signalling overhead and may scale up when signalling the SSB information to TRPs from neighboring cells.

For example, the location management function (LMF) entity may be responsible for managing the co-ordination and resource allocation related to the location of a UE. It may also compute the UE's location and velocity estimate, in addition to the achieved accuracy. In NR Rel-16, several positioning techniques have been considered, which are RAT-dependent and require network coordination with regard to UE-assisted positioning. The RAT-dependent positioning techniques exploit measurements reported by the UE and gNB in order to obtain the position estimate of a UE and can be broadly grouped into two categories, viz. downlink-(DL) and uplink (UL)-based positioning where the measurements are performed at the UE and gNB, respectively. However, one positioning technique known as Multi-Round Trip Time Positioning (Multi-RTT) may require both measurements from the UE and gNB in order for the LMF to compute the location estimate of the UE. The UE may perform measurements related to the UE Rx-Tx (Receiver and Transmitter time difference) and downlink positioning reference signals (DL-PRS), while the Transmission-Reception Points (TRPs) measure the gNB Rx-Tx based on Uplink Sounding Reference (UL-SRS) which form part of Uplink Positioning Reference Signal (UL-PRS) configuration. These may be all configured via assistance data provided by the LMF. Tight co-ordination between the LMF and gNB may be therefore required.

The following aspects related to the signalling were finalized in relation to the Multi-RTT positioning technique for NR Rel-16.

1. For Multi-RTT positioning, the DL-PRS information for the candidate TRPs may be provided by an LMF to the UE in an LPP Provide Assistance Data message.

2. The time/frequency occupancy of the DL-PRS required in the UL-PRS (SRS) information may be provided as part of the DL-PRS assistance data for Multi-RTT positioning. UL-PRS (SRS) information may include an index/pointer to the relevant information in the DL-PRS assistance data (e.g., DL-PRS Resource Set ID/Resource ID).

3. The time/frequency occupancy of the SSBs required in both, DL-PRS and UL-PRS may be grouped in a single IE, and a pointer/index may be used to reference the required information.

4. UL-SRS (both Rel-15 and Rel-16) for positioning may be configured by RRC.

Therefore, hereinafter, based on an embodiment of the present disclosure, a method of efficient assistance data transfer in NR positioning and an apparatus supporting this method will be proposed.

Referring to an embodiment of the present disclosure, a subscription-based signalling method where the LMF can subscribe to periodic/aperiodic information regarding the availability of its requested assistance data configurations at the gNB, e.g. available UL SRS (UL-PRS) resources corresponding to a set of candidate TRPs, may be provided. The subscription may also be cancelled once the LMF does not require any more measurements from the gNB.

Referring to an embodiment of the present disclosure, a common SSB configuration and delta signalling of the SSB configuration may be considered depending on if the DL-PRS or UL-PRS PRS configuration is initially received by the UE, in order to avoid duplication of the SSB information.

There needs to be tight coordination between the LMF and gNB for the different uplink positioning techniques, which require gNB measurements. In order to limit the amount of information requests to gNB from the LMF, a subscription-based signalling approach is proposed.

FIG. 17 illustrates the subscription-based approach for receiving indications about the availability of candidate TRPs for facilitating the configuration of assistance data for the required TRPs by the LMF.

FIG. 17 shows an LMF subscription-based method for receiving available assistance data configuration from gNB, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 17 may be combined with various embodiments of the present disclosure.

Referring to the FIG. 17 , in step S1710, the LMF may initiate a subscription request for receiving assistance data configuration based on available candidate TRPs with associated configuration parameters such as type of transmission aperiodic or periodic. In step S1711, the serving gNB may confirm or reject the subscription request from the LMF.

In step S1720, upon confirmation of the subscription request, the gNB may generate the available configuration including, e.g. the available frequency layers, and/or number of resources/resource availability of all TRPs under the serving gNB. The gNB then may periodically/aperiodically provide the available configuration, which may at least contain the following parameters: Number of available TRPs, Number of available frequency layers, For each frequency layer: Number of available SRS resource set per frequency layer, Number of available transmissions for all SRS resources, and/or Bandwidth for all SRS resources, For each SRS resource set: Number of SRS resources in that resource set, and/or Additional configuration parameters that may be available as per the assistance data configuration request in step S1710.

In step S1730, the LMF then may select the desired TRPs based on the gNB's indication.

In step S1740, the LMF may provide the assistance data configuration based on step S1730. In step S1750, the gNB may provide the SRS configuration to the UE via RRC signalling. The gNB can thereafter activate an aperiodic SRS transmission by DCI or semi-persistently using the MAC CE.

In step S1760, the gNB may perform the required UL-PRS measurements based on the SRS received from the UE and may directly forward the measurements to the LMF in accordance with the step S1780. In step S1770, the LMF may also request the SRS measurements from the gNB and can trigger this request depending on whether the measurements were received or not or updated measurements need to be provided. In step S1780, the gNB may forward the measurements to the LMF to assist in the UE location estimate computation. In step S1790, the LMF can cancel the subscription based on its own needs/requirements.

Referring to an embodiment of the present disclosure, an additional embodiment of the present invention may be proposed. The issue related to signalling a duplicated SSB information configuration to the UE is indicated in FIG. 18 .

FIG. 18 shows the issue pertaining to the duplicate SSB configuration to the UE, in accordance with an embodiment of the present disclosure. The embodiment of the FIG. 18 may be combined with various embodiments of the present disclosure.

Referring to the FIG. 18 , in steps S1830 and S1840, the SSB information regarding the UL-PRS and DL-PRS may be signaled via the RRC and LPP respectively. For example, operations before step S1830 (step S1810 and step S1820) may be same with operations before the step S1750 in the FIG. 17 . For example, in step S1830, the serving gNB (or TRP) may transmit a RRC reconfiguration message to the UE. For example, the RRC reconfiguration message may include SRS (UL-PRS) configuration as part of UL BWP configuration with SSB information. For example, in step S1840, a LMF may transmit a LPP message, which provides assistance data including DL-PRS with SSB information, to the UE.

This envisioned SSB information for both UL-PRS and DL-PRS can be seen in Table 5.

TABLE 5 DL-PRS UL-PRS No. Parmeters Parameters Description 1 PCI of the cell PCI of the cell Physical Cell Identity 2 ssbFrequency ssbFrequency with Center Frequency where the SSB is transmitted with values: values: ARFCN- ARFCN- ValueNR ValueNR 3 halfFrameIndex halfFrameIndex The UE can locate the frame that carries the SSB using the with values: 0 or 1 with values: 0 or 1 SFN-SSB Offset and SSB-Periodicity. The Half Frame Index then defines whether the SSB appears in the first half of the frame or the second. 4 SSB-periodicity SSB-periodicity Periodicity of the SSB of the serving TRP with the values: with values: ServingCellConfigCommon ServingCellConfigCommon IE. IE. 5 ssbSubcarrierSpacing ssbSubcarrierSpacing Defines the subcarrier spacing of the SSB and the case number with values: with values: (Clause 4.1 in 38.213 [7]) which controls, for a half frame SubcarrierSpacing SubcarrierSpacing with SS/PBCH blocks, the first symbol index for the IE IE SS/PBCH blocks. If the value is A, the SCS is 15 kHz, if the value is B or C, the SCS is 30 kHz, if the value is D the SCS is 120 kHz, if the value is E, the SCS is 240 KHz. Note that, providing the SCS explicitly without the case number would not be sufficient for the case of 30 kHz since both cases B and C are applicable, and the UE would be required to blindly search for both. 6 SFN-SSBoffset SFN-SSBoffset Each TRP may transmit an SSB on a different frame index with values with values: with a given periodicity. For example, if the periodicity is 20 {0, 1, 2, . . . 15} {0, 1, 2, . . . 15} msec, the SSB may be either in the first frame or the second frame. Note that this is not the SFN offset of the neighbouring TRP with respect to the reference TRP, but rather it is the SFN offset of the SSB of the neigbouring TRP with respect to the SFN0 of that TRP. Since the maximum periodicity is 160 msec, this can take up to 16 values. 7 Working Smtc per SSB SMTC and Measurement gap should be set accordingly. The assumption: Smtc frequency layer IE SSB-MTC is used to configure measurement timing per SSB with values: SSB- configurations, i.e., timing occasions at which the UE frequency layer MTC measures SSBs. with values: SSB- MTC 8 SSB Index SSB Index The IE SSB-Index identifies an SS-Block within an SS-Burst. 9 SS-PBCH- Average EPRE of the resources elements that carry BlockPower (at secondary synchronization signals in dBm that the NW least when SSB is used for SSB transmission, see TS 38.213 [13], clause 7. used as pathlossReference RS for an SRS) 10 SSB- SFN0 Offset per SSB-positionInBurst: Indicates the time domain positions positionInBurst physical cell ID: of the transmitted SS-blocks in a half frame with SS/PBCH with values: of Time offset of the blocks as defined in TS 38.213 [7], clause 4.1. The ServingCellConfigCommon SFN0 slot0 of a first/leftmost bit corresponds to SS/PBCH block index 0, IE. given cell with the second bit corresponds to SS/PBCH block index 1, and so respect to the on. Value 0 in the bitmap indicates that the corresponding serving Pcell. SS/PBCH block is not transmitted while value 1 indicates Offset related to that the corresponding SS/PBCH block is transmitted. SFN = 0

Table 5 indicates the SSB information for both the UL-PRS and DL-PRS configurations. Referring to the Table 5, parameters 1 to 8 of the SSB configuration can be grouped together, e.g. as a PRSCommonSSBConfig, since they are the same for both the DL-PRS and UL-PRS configuration. This PRSCommonSSBConfig can be signaled via RRC or LPP in order to avoid duplication. The delta configuration underlined in Table 5 (Parameters 9 and 10) can be signaled using RRC for the SS-PBCH-BlockPower and SFNO Offset per Physical Cell ID parameters, e.g. using an ULPRSDeltaSSBConfig IE and using LPP for SSB-positionInBurst, e.g. DLPRSDeltaSSBConfig IE. The options for signalling the common SSB information are indicated in FIG. 19 via RRC and in FIG. 20 via LPP. The associated delta configurations are also shown in FIG. 19 and FIG. 20 .

FIG. 19 shows the common SSB signalling configuration using RRC, in accordance with an embodiment of the present disclosure. The embodiment of the FIG. 19 may be combined with various embodiments of the present disclosure.

Referring to the FIG. 19 , operations before step S1930 (step S1910 and step S1920) may be same with operations before the step S1750 in the FIG. 17 . For example, in step S1930, the serving gNB (or TRP) may transmit a RRC reconfiguration message to the UE. For example, the RRC reconfiguration message may include the PRSCommonSSBConfig and the ULPRSDeltaSSBConfig in the Table 5. For example, in step S1940, a LMF may transmit a LPP message, which includes the DLPRSDeltaSSBConfig in the Table 5, to the UE.

FIG. 20 shows the common SSB signalling configuration using LPP, in accordance with an embodiment of the present disclosure. The embodiment of the FIG. 20 may be combined with various embodiments of the present disclosure.

Referring to the FIG. 20 , operations before step S2030 (step S2010 and step S2020) may be same with operations before the step S1750 in the FIG. 17 . For example, in step S2030, a LMF may transmit a LPP message, which provides the assistance data including DL-PRS configuration with common SSB configuration, to the UE. For example, the assistance data including DL-PRS configuration with common SSB configuration may include PRSCommonSSBConfig and DLPRSDeltaSSBConfig in the Table 5. For example, in step S2040, a serving gNB (or TRP) may transmit a RRC reconfiguration message to the UE. The RRC reconfiguration message may include UL-PRS delta configuration with ULPRSDeltaSSBConfig.

For example, various embodiments of the present disclosure may be combined with at least one of a synchronization operation of a UE, a transmission/reception operation through a BWP of the UE, a power control operation of the UE, a congestion control operation of the UE, an SL HARQ feedback operation of the UE, and/or a channel coding operation of the UE.

FIG. 21 shows a procedure of receiving configuration by a first apparatus, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 21 may be combined with various embodiments of the present disclosure.

Referring to FIG. 21 , in step S2110, the first apparatus may receive configuration related to a downlink (DL) positioning reference signal (PRS) from a location management function (LMF). For example, the configuration related to the DL PRS may include at least one of first information related to a synchronization signal block (SSB) or second information related to the SSB. In step S2120, the first apparatus may receive configuration related to an uplink (UL) PRS from a base station. For example, the configuration related to the UL PRS may include at least one of the first information or third information related to the SSB. And, in step S2130, the first apparatus may perform positioning based on round trip time (RTT), based on the configuration related to the DL PRS and the configuration related to the UL PRS. For example, based on the configuration related to the DL PRS which includes the first information, the configuration related to the UL PRS may not include the first information. And, for example, wherein based on the configuration related to the UL PRS which includes the first information, the configuration related to the DL PRS may not include the first information.

For example, additionally, the first apparatus may receive the SSB based on at least one of the first information, the second information, or the third information.

For example, the first information may include at least one of information related to a physical cell identity (PCI), information related to a center frequency through which the SSB is transmitted, information related to a frame in which the SSB is transmitted, information related to a periodicity of the SSB, information related to subcarrier spacing (SCS) of the SSB, information related to single frequency network (SFN), information related to measurement timing of the SSB, or SSB index.

For example, the information related to the PCI may include information related to a cell related to the first apparatus.

For example, the information related to the center frequency may include a value related to an absolute radio frequency channel number (ARFCN).

For example, the information related to the frame in which the SSB is transmitted may include a timing where the SSB is transmitted in the frame in which the SSB is transmitted.

For example, based on the information related to the frame in which the SSB is transmitted is 0, the SSB may be transmitted in a first half frame of the frame in which the SSB is transmitted, and wherein based on the information related to the frame in which the SSB is transmitted is 1, the SSB may be transmitted in a second half frame of the frame in which the SSB is transmitted.

For example, the information related to the periodicity of the SSB may include information related to the periodicity of the SSB related to a serving transmission reception point (TRP) of the first apparatus.

For example, the information related to the SCS of the SSB may include information related to a case number related to the SSB.

For example, the information related to the SFN may include information related to a SFN offset of the SSB, and the SFN offset of the SSB may include an offset related to SFN 0 of a neighbor TRP.

For example, the SSB index may be for identifying the SSB in a synchronization signal (SS) burst.

For example, the second information may include information related to a time domain positions of the SSB in a half frame.

For example, the third information may include information related to an energy per resource element (EPRE) of a secondary synchronization signal (SSS) related to the SSB, or information related to an offset of SFN 0 per physical cell ID with respect to a serving Pcell.

Examples described above may be applied to variable devices which will be described below. For example, a processor (102) of a first apparatus (100) may receive configuration related to a downlink (DL) positioning reference signal (PRS) from a location management function (LMF). And, the processor (102) of the first apparatus (100) may receive configuration related to an uplink (UL) PRS from a base station (200). And, the processor (102) of the first apparatus (100) may perform positioning based on round trip time (RTT), based on the configuration related to the DL PRS and the configuration related to the UL PRS.

Referring to an embodiment of the present disclosure, a first apparatus for performing wireless communication may be provided. The first apparatus may comprise one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: receive configuration related to a downlink (DL) positioning reference signal (PRS) from a location management function (LMF), wherein the configuration related to the DL PRS includes at least one of first information related to a synchronization signal block (SSB) or second information related to the SSB; receive configuration related to an uplink (UL) PRS from a base station, wherein the configuration related to the UL PRS includes at least one of the first information or third information related to the SSB; and perform positioning based on round trip time (RTT), based on the configuration related to the DL PRS and the configuration related to the UL PRS, wherein based on the configuration related to the DL PRS which includes the first information, the configuration related to the UL PRS doesn't include the first information, and wherein based on the configuration related to the UL PRS which includes the first information, the configuration related to the DL PRS doesn't include the first information.

Referring to an embodiment of the present disclosure, an apparatus configured to control a first user equipment (UE) may be provided. For example, the apparatus may comprise one or more processors; and one or more memories operably connectable to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: receive configuration related to a downlink (DL) positioning reference signal (PRS) from a location management function (LMF), wherein the configuration related to the DL PRS includes at least one of first information related to a synchronization signal block (SSB) or second information related to the SSB; receive configuration related to an uplink (UL) PRS from a base station, wherein the configuration related to the UL PRS includes at least one of the first information or third information related to the SSB; and perform positioning based on round trip time (RTT), based on the configuration related to the DL PRS and the configuration related to the UL PRS, wherein based on the configuration related to the DL PRS which includes the first information, the configuration related to the UL PRS doesn't include the first information, and wherein based on the configuration related to the UL PRS which includes the first information, the configuration related to the DL PRS doesn't include the first information.

Referring to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, when the instructions are executed, it cause a first apparatus to: receive configuration related to a downlink (DL) positioning reference signal (PRS) from a location management function (LMF), wherein the configuration related to the DL PRS includes at least one of first information related to a synchronization signal block (SSB) or second information related to the SSB; receive configuration related to an uplink (UL) PRS from a base station, wherein the configuration related to the UL PRS includes at least one of the first information or third information related to the SSB; and perform positioning based on round trip time (RTT), based on the configuration related to the DL PRS and the configuration related to the UL PRS, wherein based on the configuration related to the DL PRS which includes the first information, the configuration related to the UL PRS doesn't include the first information, and wherein based on the configuration related to the UL PRS which includes the first information, the configuration related to the DL PRS doesn't include the first information.

FIG. 22 shows a procedure of transmitting configuration by a base station, in accordance with an embodiment of the present disclosure. The embodiment of FIG. 22 may be combined with various embodiments of the present disclosure.

Referring to FIG. 22 , in step S2210, the base station may transmitting configuration related to an uplink (UL) positioning reference signal (PRS) to a first apparatus. For example, configuration related to a downlink (DL) PRS may include at least one of first information related to a synchronization signal block (SSB) or second information related to the SSB. For example, the configuration related to the uplink (UL) PRS may include at least one of the first information or third information related to the SSB. For example, positioning based on round trip time (RTT) may be performed based on the configuration related to the DL PRS and the configuration related to the UL PRS. For example, based on the configuration related to the DL PRS which includes the first information, the configuration related to the UL PRS may not include the first information. And, For example, based on the configuration related to the UL PRS which includes the first information, the configuration related to the DL PRS may not include the first information.

For example, the SSB may be received by the first apparatus based on at least one of the first information, the second information, or the third information.

Examples described above may be applied to variable devices which will be described below. For example, a processor (202) of a base station (200) may transmit configuration related to an uplink (UL) positioning reference signal (PRS) to a first apparatus (100).

Referring to an embodiment of the present disclosure, a base station for performing wireless communication may be provided. The base station may comprise one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: transmit configuration related to an uplink (UL) positioning reference signal (PRS) to a first apparatus, wherein configuration related to a downlink (DL) PRS includes at least one of first information related to a synchronization signal block (SSB) or second information related to the SSB, wherein the configuration related to the uplink PRS includes at least one of the first information or third information related to the SSB; wherein positioning based on round trip time (RTT) is performed based on the configuration related to the DL PRS and the configuration related to the UL PRS, wherein based on the configuration related to the DL PRS which includes the first information, the configuration related to the UL PRS doesn't include the first information, and wherein based on the configuration related to the UL PRS which includes the first information, the configuration related to the DL PRS doesn't include the first information.

For example, the SSB may be received by the first apparatus based on at least one of the first information, the second information, or the third information.

Hereinafter, an apparatus to which various embodiments of the present disclosure can be applied will be described.

The various descriptions, functions, procedures, proposals, methods, and/or operational flowcharts of the present disclosure described in this document may be applied to, without being limited to, a variety of fields requiring wireless communication/connection (e.g., 5G) between devices.

Hereinafter, a description will be given in more detail with reference to the drawings. In the following drawings/description, the same reference symbols may denote the same or corresponding hardware blocks, software blocks, or functional blocks unless described otherwise.

FIG. 23 shows a communication system 1, in accordance with an embodiment of the present disclosure.

Referring to FIG. 23 , a communication system 1 to which various embodiments of the present disclosure are applied includes wireless devices, Base Stations (BSs), and a network. Herein, the wireless devices represent devices performing communication using Radio Access Technology (RAT) (e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE)) and may be referred to as communication/radio/5G devices. The wireless devices may include, without being limited to, a robot 100 a, vehicles 100 b-1 and 100 b-2, an eXtended Reality (XR) device 100 c, a hand-held device 100 d, a home appliance 100 e, an Internet of Things (IoT) device 100 f, and an Artificial Intelligence (AI) device/server 400. For example, the vehicles may include a vehicle having a wireless communication function, an autonomous vehicle, and a vehicle capable of performing communication between vehicles. Herein, the vehicles may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) device and may be implemented in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), and a computer (e.g., a notebook). The home appliance may include a TV, a refrigerator, and a washing machine. The IoT device may include a sensor and a smartmeter. For example, the BSs and the network may be implemented as wireless devices and a specific wireless device 200 a may operate as a BS/network node with respect to other wireless devices.

Here, wireless communication technology implemented in wireless devices 100 a to 100 f of the present disclosure may include Narrowband Internet of Things for low-power communication in addition to LTE, NR, and 6G. In this case, for example, NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology and may be implemented as standards such as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the name described above. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100 a to 100 f of the present disclosure may perform communication based on LTE-M technology. In this case, as an example, the LTE-M technology may be an example of the LPWAN and may be called by various names including enhanced Machine Type Communication (eMTC), and the like. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat Ml, 3) LTE Cat M2, 4) LTE non-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) LTE M, and is not limited to the name described above. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100 a to 100 f of the present disclosure may include at least one of Bluetooth, Low Power Wide Area Network (LPWAN), and ZigBee considering the low-power communication, and is not limited to the name described above. As an example, the ZigBee technology may generate personal area networks (PAN) related to small/low-power digital communication based on various standards including IEEE 802.15.4, and the like, and may be called by various names.

The wireless devices 100 a to 100 f may be connected to the network 300 via the BSs 200. An AI technology may be applied to the wireless devices 100 a to 100 f and the wireless devices 100 a to 100 f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100 a to 100 f may communicate with each other through the BSs 200/network 300, the wireless devices 100 a to 100 f may perform direct communication (e.g., sidelink communication) with each other without passing through the BSs/network. For example, the vehicles 100 b-1 and 100 b-2 may perform direct communication (e.g. Vehicle-to-Vehicle (V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may be established between the wireless devices 100 a to 100 f/BS 200, or BS 200/BS 200. Herein, the wireless communication/connections may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication 150 a, sidelink communication 150 b (or, D2D communication), or inter BS communication (e.g. relay, Integrated Access Backhaul (IAB)). The wireless devices and the BSs/the wireless devices may transmit/receive radio signals to/from each other through the wireless communication/connections 150 a and 150 b. For example, the wireless communication/connections 150 a and 150 b may transmit/receive signals through various physical channels. To this end, at least a part of various configuration information configuring processes, various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocating processes, for transmitting/receiving radio signals, may be performed based on the various proposals of the present disclosure.

FIG. 24 shows wireless devices, in accordance with an embodiment of the present disclosure.

Referring to FIG. 24 , a first wireless device 100 and a second wireless device 200 may transmit radio signals through a variety of RATs (e.g., LTE and NR). Herein, {the first wireless device 100 and the second wireless device 200} may correspond to {the wireless device 100 x and the BS 200} and/or {the wireless device 100 x and the wireless device 100 x} of FIG. 23 .

The first wireless device 100 may include one or more processors 102 and one or more memories 104 and additionally further include one or more transceivers 106 and/or one or more antennas 108. The processor(s) 102 may control the memory(s) 104 and/or the transceiver(s) 106 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. For example, the processor(s) 102 may process information within the memory(s) 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver(s) 106. The processor(s) 102 may receive radio signals including second information/signals through the transceiver 106 and then store information obtained by processing the second information/signals in the memory(s) 104. The memory(s) 104 may be connected to the processor(s) 102 and may store a variety of information related to operations of the processor(s) 102. For example, the memory(s) 104 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 102 or for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. Herein, the processor(s) 102 and the memory(s) 104 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR). The transceiver(s) 106 may be connected to the processor(s) 102 and transmit and/or receive radio signals through one or more antennas 108. Each of the transceiver(s) 106 may include a transmitter and/or a receiver. The transceiver(s) 106 may be interchangeably used with Radio Frequency (RF) unit(s). In the present disclosure, the wireless device may represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202 and one or more memories 204 and additionally further include one or more transceivers 206 and/or one or more antennas 208. The processor(s) 202 may control the memory(s) 204 and/or the transceiver(s) 206 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. For example, the processor(s) 202 may process information within the memory(s) 204 to generate third information/signals and then transmit radio signals including the third information/signals through the transceiver(s) 206. The processor(s) 202 may receive radio signals including fourth information/signals through the transceiver(s) 106 and then store information obtained by processing the fourth information/signals in the memory(s) 204. The memory(s) 204 may be connected to the processor(s) 202 and may store a variety of information related to operations of the processor(s) 202. For example, the memory(s) 204 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 202 or for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. Herein, the processor(s) 202 and the memory(s) 204 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR). The transceiver(s) 206 may be connected to the processor(s) 202 and transmit and/or receive radio signals through one or more antennas 208. Each of the transceiver(s) 206 may include a transmitter and/or a receiver. The transceiver(s) 206 may be interchangeably used with RF unit(s). In the present disclosure, the wireless device may represent a communication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 will be described more specifically. One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Unit (SDUs) according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software and the firmware or software may be configured to include the modules, procedures, or functions. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 so as to be driven by the one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands. The one or more memories 104 and 204 may be configured by Read-Only Memories (ROMs), Random Access Memories (RAMs), Electrically Erasable Programmable Read-Only Memories (EPROMs), flash memories, hard drives, registers, cash memories, computer-readable storage media, and/or combinations thereof. The one or more memories 104 and 204 may be located at the interior and/or exterior of the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, control information, and/or radio signals/channels, mentioned in the methods and/or operational flowcharts of this document, to one or more other devices. The one or more transceivers 106 and 206 may receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, from one or more other devices. For example, the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. The one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208 and the one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, through the one or more antennas 108 and 208. In this document, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 may convert received radio signals/channels etc. from RF band signals into baseband signals in order to process received user data, control information, radio signals/channels, etc. using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert the user data, control information, radio signals/channels, etc. processed using the one or more processors 102 and 202 from the base band signals into the RF band signals. To this end, the one or more transceivers 106 and 206 may include (analog) oscillators and/or filters.

FIG. 25 shows a signal process circuit for a transmission signal, in accordance with an embodiment of the present disclosure.

Referring to FIG. 25 , a signal processing circuit 1000 may include scramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040, resource mappers 1050, and signal generators 1060. An operation/function of FIG. 25 may be performed, without being limited to, the processors 102 and 202 and/or the transceivers 106 and 206 of FIG. 24 . Hardware elements of FIG. 25 may be implemented by the processors 102 and 202 and/or the transceivers 106 and 206 of FIG. 24 . For example, blocks 1010 to 1060 may be implemented by the processors 102 and 202 of FIG. 24 . Alternatively, the blocks 1010 to 1050 may be implemented by the processors 102 and 202 of FIG. 24 and the block 1060 may be implemented by the transceivers 106 and 206 of FIG. 24 .

Codewords may be converted into radio signals via the signal processing circuit 1000 of FIG. 25 . Herein, the codewords are encoded bit sequences of information blocks. The information blocks may include transport blocks (e.g., a UL-SCH transport block, a DL-SCH transport block). The radio signals may be transmitted through various physical channels (e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bit sequences by the scramblers 1010. Scramble sequences used for scrambling may be generated based on an initialization value, and the initialization value may include ID information of a wireless device. The scrambled bit sequences may be modulated to modulation symbol sequences by the modulators 1020. A modulation scheme may include pi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying (m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complex modulation symbol sequences may be mapped to one or more transport layers by the layer mapper 1030. Modulation symbols of each transport layer may be mapped (precoded) to corresponding antenna port(s) by the precoder 1040. Outputs z of the precoder 1040 may be obtained by multiplying outputs y of the layer mapper 1030 by an N*M precoding matrix W. Herein, N is the number of antenna ports and M is the number of transport layers. The precoder 1040 may perform precoding after performing transform precoding (e.g., DFT) for complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

The resource mappers 1050 may map modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMA symbols) in the time domain and a plurality of subcarriers in the frequency domain. The signal generators 1060 may generate radio signals from the mapped modulation symbols and the generated radio signals may be transmitted to other devices through each antenna. For this purpose, the signal generators 1060 may include Inverse Fast Fourier Transform (IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-Analog Converters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wireless device may be configured in a reverse manner of the signal processing procedures 1010 to 1060 of FIG. 25 . For example, the wireless devices (e.g., 100 and 200 of FIG. 24 ) may receive radio signals from the exterior through the antenna ports/transceivers. The received radio signals may be converted into baseband signals through signal restorers. To this end, the signal restorers may include frequency downlink converters, Analog-to-Digital Converters (ADCs), CP remover, and Fast Fourier Transform (FFT) modules. Next, the baseband signals may be restored to codewords through a resource demapping procedure, a postcoding procedure, a demodulation processor, and a descrambling procedure. The codewords may be restored to original information blocks through decoding. Therefore, a signal processing circuit (not illustrated) for a reception signal may include signal restorers, resource demappers, a postcoder, demodulators, descramblers, and decoders.

FIG. 26 shows another example of a wireless device, in accordance with an embodiment of the present disclosure. The wireless device may be implemented in various forms according to a use-case/service (refer to FIG. 23 ).

Referring to FIG. 26 , wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 24 and may be configured by various elements, components, units/portions, and/or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140. The communication unit may include a communication circuit 112 and transceiver(s) 114. For example, the communication circuit 112 may include the one or more processors 102 and 202 and/or the one or more memories 104 and 204 of FIG. 24 . For example, the transceiver(s) 114 may include the one or more transceivers 106 and 206 and/or the one or more antennas 108 and 208 of FIG. 24 . The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140 and controls overall operation of the wireless devices. For example, the control unit 120 may control an electric/mechanical operation of the wireless device based on programs/code/commands/information stored in the memory unit 130. The control unit 120 may transmit the information stored in the memory unit 130 to the exterior (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface or store, in the memory unit 130, information received through the wireless/wired interface from the exterior (e.g., other communication devices) via the communication unit 110.

The additional components 140 may be variously configured according to types of wireless devices. For example, the additional components 140 may include at least one of a power unit/battery, input/output (I/O) unit, a driving unit, and a computing unit. The wireless device may be implemented in the form of, without being limited to, the robot (100 a of FIG. 23 ), the vehicles (100 b-1 and 100 b-2 of FIG. 23 ), the XR device (100 c of FIG. 23 ), the hand-held device (100 d of FIG. 23 ), the home appliance (100 e of FIG. 23 ), the IoT device (100 f of FIG. 23 ), a digital broadcast terminal, a hologram device, a public safety device, an MTC device, a medicine device, a fintech device (or a finance device), a security device, a climate/environment device, the AI server/device (400 of FIG. 23 ), the BSs (200 of FIG. 23 ), a network node, etc. The wireless device may be used in a mobile or fixed place according to a use-example/service.

In FIG. 26 , the entirety of the various elements, components, units/portions, and/or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected by wire and the control unit 120 and first units (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. Each element, component, unit/portion, and/or module within the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. As an example, the control unit 120 may be configured by a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphical processing unit, and a memory control processor. As another example, the memory 130 may be configured by a Random Access Memory (RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory, a volatile memory, a non-volatile memory, and/or a combination thereof

Hereinafter, an example of implementing FIG. 26 will be described in detail with reference to the drawings.

FIG. 27 shows a hand-held device, in accordance with an embodiment of the present disclosure. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), or a portable computer (e.g., a notebook). The hand-held device may be referred to as a mobile station (MS), a user terminal (UT), a Mobile Subscriber Station (MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or a Wireless Terminal (WT).

Referring to FIG. 27 , a hand-held device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140 a, an interface unit 140 b, and an I/O unit 140 c. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130/140 a to 140 c correspond to the blocks 110 to 130/140 of FIG. 26 , respectively.

The communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling constituent elements of the hand-held device 100. The control unit 120 may include an Application Processor (AP). The memory unit 130 may store data/parameters/programs/code/commands needed to drive the hand-held device 100. The memory unit 130 may store input/output data/information. The power supply unit 140 a may supply power to the hand-held device 100 and include a wired/wireless charging circuit, a battery, etc. The interface unit 140 b may support connection of the hand-held device 100 to other external devices.

The interface unit 140 bmay include various ports (e.g., an audio I/O port and a video I/O port) for connection with external devices. The I/O unit 140 c may input or output video information/signals, audio information/signals, data, and/or information input by a user. The I/O unit 140 c may include a camera, a microphone, a user input unit, a display unit 140 d, a speaker, and/or a haptic module.

As an example, in the case of data communication, the I/O unit 140 c may acquire information/signals (e.g., touch, text, voice, images, or video) input by a user and the acquired information/signals may be stored in the memory unit 130. The communication unit 110 may convert the information/signals stored in the memory into radio signals and transmit the converted radio signals to other wireless devices directly or to a BS. The communication unit 110 may receive radio signals from other wireless devices or the BS and then restore the received radio signals into original information/signals. The restored information/signals may be stored in the memory unit 130 and may be output as various types (e.g., text, voice, images, video, or haptic) through the I/O unit 140 c.

FIG. 28 shows a vehicle or an autonomous vehicle, in accordance with an embodiment of the present disclosure. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned/unmanned Aerial Vehicle (AV), a ship, etc.

Referring to FIG. 28 , a vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140 a, a power supply unit 140 b, a sensor unit 140 c, and an autonomous driving unit 140 d. The antenna unit 108 may be configured as a part of the communication unit 110. The blocks 110/130/140 a to 140 d correspond to the blocks 110/130/140 of FIG. 26 , respectively.

The communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and road side units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100. The control unit 120 may include an Electronic Control Unit (ECU). The driving unit 140 a may cause the vehicle or the autonomous vehicle 100 to drive on a road. The driving unit 140 a may include an engine, a motor, a powertrain, a wheel, a brake, a steering device, etc. The power supply unit 140 bmay supply power to the vehicle or the autonomous vehicle 100 and include a wired/wireless charging circuit, a battery, etc. The sensor unit 140 c may acquire a vehicle state, ambient environment information, user information, etc. The sensor unit 140 c may include an Inertial Measurement Unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward/backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, etc. The autonomous driving unit 140 d may implement technology for maintaining a lane on which a vehicle is driving, technology for automatically adjusting speed, such as adaptive cruise control, technology for autonomously driving along a determined path, technology for driving by automatically setting a path if a destination is set, and the like.

For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140 d may generate an autonomous driving path and a driving plan from the obtained data. The control unit 120 may control the driving unit 140 a such that the vehicle or the autonomous vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed/direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically/periodically acquire recent traffic information data from the external server and acquire surrounding traffic information data from neighboring vehicles. In the middle of autonomous driving, the sensor unit 140 c may obtain a vehicle state and/or surrounding environment information. The autonomous driving unit 140 d may update the autonomous driving path and the driving plan based on the newly obtained data/information. The communication unit 110 may transfer information about a vehicle position, the autonomous driving path, and/or the driving plan to the external server. The external server may predict traffic information data using AI technology, etc., based on the information collected from vehicles or autonomous vehicles and provide the predicted traffic information data to the vehicles or the autonomous vehicles.

Claims in the present description can be combined in a various way. For instance, technical features in method claims of the present description can be combined to be implemented or performed in an apparatus, and technical features in apparatus claims can be combined to be implemented or performed in a method. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in an apparatus. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in a method. 

1. A method of performing, by a first apparatus, wireless communication, the method comprising: receiving configuration related to a downlink (DL) positioning reference signal (PRS) from a location management function (LMF), wherein the configuration related to the DL PRS includes at least one of first information related to a synchronization signal block (SSB) or second information related to the SSB; receiving configuration related to an uplink (UL) PRS from a base station, wherein the configuration related to the UL PRS includes at least one of the first information or third information related to the SSB; and performing positioning based on round trip time (RTT), based on the configuration related to the DL PRS and the configuration related to the UL PRS, wherein based on the configuration related to the DL PRS which includes the first information, the configuration related to the UL PRS does not include the first information, and wherein based on the configuration related to the UL PRS which includes the first information, the configuration related to the DL PRS does not include the first information.
 2. The method of claim 1, further comprising: receiving the SSB based on at least one of the first information, the second information, or the third information.
 3. The method of claim 1, wherein the first information includes at least one of information related to a physical cell identity (PCI), information related to a center frequency through which the SSB is transmitted, information related to a frame in which the SSB is transmitted, information related to a periodicity of the SSB, information related to subcarrier spaing (SCS) of the SSB, information related to single frequency network (SFN), information related to measurement timing of the SSB, or SSB index.
 4. The method of claim 3, wherein the information related to the PCI includes information related to a cell related to the first apparatus.
 5. The method of claim 3, wherein the information related to the center frequency includes a value related to an absolute radio frequency channel number (ARFCN).
 6. The method of claim 3, wherein the information related to the frame in which the SSB is transmitted includes a timing where the SSB is transmitted in the frame in which the SSB is transmitted.
 7. The method of claim 6, wherein based on the information related to the frame in which the SSB is transmitted is 0, the SSB is transmitted in a first half frame of the frame in which the SSB is transmitted, and wherein based on the information related to the frame in which the SSB is transmitted is 1, the SSB is transmitted in a second half frame of the frame in which the SSB is transmitted.
 8. The method of claim 3, wherein the information related to the periodicity of the SSB includes information related to the periodicity of the SSB related to a serving transmission reception point (TRP) of the first apparatus.
 9. The method of claim 3, wherein the information related to the SCS of the SSB includes information related to a case number related to the SSB.
 10. The method of claim 3, wherein the information related to the SFN includes information related to a SFN offset of the SSB, and wherein the SFN offset of the SSB includes an offset related to SFN 0 of a neighbor TRP.
 11. The method of claim 3, wherein the SSB index is for identifying the SSB in a synchronization signal (SS) burst.
 12. The method of claim 1, wherein the second information includes information related to a time domain positions of the SSB in a half frame.
 13. The method of claim 1, wherein the third information includes information related to an energy per resource element (EPRE) of a secondary synchronization signal (SSS) related to the SSB, or information related to an offset of SFN 0 per physical cell ID with respect to a serving primary cell (Pcell).
 14. A first apparatus for performing wireless communication, the first apparatus comprising: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to: receive configuration related to a downlink (DL) positioning reference signal (PRS) from a location management function (LMF), wherein the configuration related to the DL PRS includes at least one of first information related to a synchronization signal block (SSB) or second information related to the SSB; receive configuration related to an uplink (UL) PRS from a base station, wherein the configuration related to the UL PRS includes at least one of the first information or third information related to the SSB; and perform positioning based on round trip time (RTT), based on the configuration related to the DL PRS and the configuration related to the UL PRS, wherein based on the configuration related to the DL PRS which includes the first information, the configuration related to the UL PRS does not include the first information, and wherein based on the configuration related to the UL PRS which includes the first information, the configuration related to the DL PRS does not include the first information.
 15. An apparatus configured to control a first user equipment (UE), the apparatus comprising: one or more processors; and one or more memories operably connectable to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to: receive configuration related to a downlink (DL) positioning reference signal (PRS) from a location management function (LMF), wherein the configuration related to the DL PRS includes at least one of first information related to a synchronization signal block (SSB) or second information related to the SSB; receive configuration related to an uplink (UL) PRS from a base station, wherein the configuration related to the UL PRS includes at least one of the first information or third information related to the SSB; and perform positioning based on round trip time (RTT), based on the configuration related to the DL PRS and the configuration related to the UL PRS, wherein based on the configuration related to the DL PRS which includes the first information, the configuration related to the UL PRS does not include the first information, and wherein based on the configuration related to the UL PRS which includes the first information, the configuration related to the DL PRS does not include the first information. 16-20. (canceled) 